github.com/kafkaliu/etcd@v0.1.2-0.20131007164923-44c16dd30d69/machines.go (about) 1 /* 2 Copyright 2013 CoreOS Inc. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package main 18 19 // machineNum returns the number of machines in the cluster 20 func machineNum() int { 21 response, _ := etcdStore.RawGet("_etcd/machines") 22 23 return len(response) 24 } 25 26 // getMachines gets the current machines in the cluster 27 func getMachines(toURL func(string) (string, bool)) []string { 28 29 peers := r.Peers() 30 31 machines := make([]string, len(peers)+1) 32 33 leader, ok := toURL(r.Leader()) 34 self, _ := toURL(r.Name()) 35 i := 1 36 37 if ok { 38 machines[0] = leader 39 if leader != self { 40 machines[1] = self 41 i = 2 42 } 43 } else { 44 machines[0] = self 45 } 46 47 // Add all peers to the slice 48 for peerName, _ := range peers { 49 if machine, ok := toURL(peerName); ok { 50 // do not add leader twice 51 if machine != leader { 52 machines[i] = machine 53 i++ 54 } 55 } 56 } 57 return machines 58 }